NH82801GHM S L8YR Intel, NH82801GHM S L8YR Datasheet - Page 651

• Manufacturer Part Number: NH82801GHM S L8YR
• Manufacturer: Intel

Specifications of NH82801GHM S L8YR

• Lead Free Status / RoHS Status: Compliant

AC ’97 Modem Controller Registers (D30:F3) (Desktop and Mobile Only)
17.1.10
17.1.11
Intel
®
ICH7 Family Datasheet
MMBAR—Modem Mixer Base Address Register
(Modem—D30:F3)
Address Offset: 10
Default Value:
The Native PCI Mode Modem uses PCI Base Address register #1 to request a
contiguous block of I/O space that is to be used for the Modem Mixer software
interface. The mixer requires 256 bytes of I/O space. All accesses to the mixer registers
are forwarded over the AC-link to the codec where the registers reside.
In the case of the split codec implementation accesses to the different codecs are
differentiated by the controller by using address offsets 00h
and address offsets 80h
MBAR—Modem Base Address Register (Modem—D30:F3)
Address Offset: 14h
Default Value:
The Modem function uses PCI Base Address register #1 to request a contiguous block
of I/O space that is to be used for the Modem software interface. The Modem Bus
Mastering register space requires 128 bytes of I/O space. All Modem registers reside in
the controller, therefore cycles are not forwarded over the AC-link to the codec.
31:16
31:16
15:8
15:7
7:1
6:1
Bit
Bit
0
0
Hardwired to 0’s.
Base Address — R/W. These bits are used in the I/O space decode of the Modem
interface registers. The number of upper bits that a device actually implements
depends on how much of the address space the device will respond to. For the AC ‘97
Modem, the upper 16 bits are hardwired to 0, while bits 15:8 are programmable. This
configuration yields a maximum I/O block size of 256 bytes for this base address.
Reserved. Read as 0
Resource Type Indicator (RTE) — RO. Hardwired to 1indicating a request for I/O space.
Hardwired to 0’s.
Base Address — R/W. These bits are used in the I/O space decode of the Modem
interface registers. The number of upper bits that a device actually implements
depends on how much of the address space the device will respond to. For the AC ‘97
Modem, the upper 16 bits are hardwired to 0, while bits 15:7 are programmable. This
configuration yields a maximum I/O block size of 128 bytes for this base address.
Reserved. Read as 0
Resource Type Indicator (RTE) — RO. Hardwired to 1 indicating a request for I/O
space.
00000001h
00000001h
–
13h
–
17h
–
FEh for the secondary codec.
Description
Description
Attribute:
Size:
Attribute:
Size:
–
7Fh for the primary codec
R/W, RO
32 bits
R/W, RO
32 bits
651